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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Significant components of deferred tax assets and liabilities    
Accrued expenses $ 15 $ 22
Reserve liabilities 11 28
Other accrued medical costs 16 5
Net operating losses 27 13
Fixed assets and intangibles 23 0
Unrealized losses 2 1
Unearned premiums 19 27
Lease financing obligation 30 38
Deferred compensation 1 6
Tax credit carryover 15 7
Valuation allowance (41) (16)
Total deferred income tax assets, net of valuation allowance 118 131
Prepaid expenses (6) (9)
Fixed assets and intangibles 0 (104)
Basis in debt (9) (23)
Total deferred income tax liabilities (15) (136)
Net deferred income tax asset (liability) $ 103  
Net deferred income tax asset (liability)   $ (5)